US4553039A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Uninterruptible power supply
Assignee: ELECTRONIC SPECIALISTS Inc A CORP OF
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Filing: 1983-11-03
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Granted: 1985-11-12
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Expires: 2003-11-03
Abstract
Abstract A variable voltage power supply including a power source connected to an electrical energy storage means by an electronic switching means. Coupled to the energy storage means is a voltage output circuit providing an output voltage for a load and electrical energy transfer thereto from the energy storage means. A voltage comparator compares the output voltage with a periodically varying reference voltage providing output signals that switch the electronic switching means to cause the output voltage to track the reference voltage.
Inventors
- 👤 Francis J. Stifter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 10:37
CPC Classifications
H; H02; H02M; H02M7/00; H02M7/42; H02M7/44; H02M7/48; H02M7/53; H02M7/537; H02M7/538; H02M7/53803; H02M7/53806; H03; H03L; H03L7/00; H03L7/06; H03L7/08
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
216 words
A variable voltage power supply comprising: power source means; voltage output means connectable between said power source means and a load, said voltage output means when connected to the load providing an AC output voltage therefor and electrical energy transfer between said power source and the load; electronic switching means comprising first and second switching means each coupled to said power source means and said voltage output means; reference source means comprising an AC source and means for producing from alternate half cycles thereof, respectively, first and second reference waveforms; voltage comparator means comprising first comparator means for comparing said first reference waveform with one phase of said AC output voltage and a second comparator means for comparing said second waveform with the opposite phase of said AC output voltage, said first comparator means being operatively coupled to said first switching means so as to produce switching thereof that causes said output voltage to track said first waveform and said second comparator means being operatively coupled to said second switching means so as to produce switching thereof that causes said output voltage to track said second waveform; and electrical energy storage means coupled to said voltage output means and storing energy provided by said source means during said switching of said first and second switching means.
Claim 2
Dependent Claim
216 words
A variable voltage power supply comprising: power source means; voltage output means connectable between said power source means and a load, said voltage output means when connected to the load providing an AC output voltage therefor and electrical energy transfer between said power source and the load; electronic switching means comprising first and second switching means each coupled to said power source means and said voltage output means; reference source means comprising an AC source and means for producing from alternate half cycles thereof, respectively, first and second reference waveforms; voltage comparator means comprising first comparator means for comparing said first reference waveform with one phase of said AC output voltage and a second comparator means for comparing said second waveform with the opposite phase of said AC output voltage, said first comparator means being operatively coupled to said first switching means so as to produce switching thereof that causes said output voltage to track said first waveform and said second comparator means being operatively coupled to said second switching means so as to produce switching thereof that causes said output voltage to track said second waveform; and electrical energy storage means coupled to said voltage output means and storing energy provided by said source means during said switching of said first and second switching means.
Claim 3
Dependent Claim
78 words
A variable voltage power supply according to claim 1, wherein said electrical energy storage means comprises first and second storage means; said first switching means comprises first electronic switch means that during on periods is driven to saturation and said first storage means limits change in said output voltage, and said second switching means comprises second electronic switch means that during on periods is driven to saturation and said second storage means limits change in said output voltage.
Claim 4
Dependent Claim
35 words
A variable voltage power supply according to claim 2 wherein said power source comprises an AC supply, and including battery means connected to alternatively receive or supply energy to said first and second storage means.
Claim 5
Dependent Claim
32 words
A variable voltage power supply according to claim 3 wherein said AC source comprises a sine wave generator, and said means for producing said first and second waveforms comprises a split rectifier.
Claim 6
Dependent Claim
34 words
A variable voltage power supply according to claim 4 wherein said reference source means further comprises phase lock means for locking the phase of said sine wave generator to that of said AC supply.
Claim 7
Dependent Claim
31 words
A variable voltage power supply according to claim 5 wherein said power source means comprises voltage regulator means coupled between said AC supply and said first and second energy storage means.
Claim 8
Dependent Claim
23 words
A variable voltage power supply according to claim 2 wherein said first and second energy storage means comprise first and second inductance means.
Claim 9
Dependent Claim
64 words
A variable voltage power supply according to claim 7 including first and second transfer means, said first transfer means transferring energy stored by said first inductance means to said source means during off periods of said first switching means, and said second transfer means transferring energy stored by said second inductance means to said source means during off periods of said second switching means.
Claim 10
Dependent Claim
108 words
A variable voltage power supply according to claim 8 wherein said first transfer means comprises a first unidirectional conduction means connected between said first inductance means and said source means and adapted to conduct current only in response to a threshold voltage provided by a collapsing magnetic field in said first inductance means caused by opening of said field switching means, and a second unidirectional conduction means connected between said second inductance means and said source means and adapted to conduct current only in response to a threshold voltage provided by a collapsing magnetic field in said second inductance means caused by opening of said second switching means.
Claim 11
Dependent Claim
19 words
A variable voltage power supply according to claim 9 wherein said first and second conduction means comprise diode means.
Claim 12
Dependent Claim
20 words
A variable voltage power supply according to claim 10 wherein said first and second comparator means comprise operational amplifier means.
Claim 13
Dependent Claim
40 words
A variable voltage power supply according to claim 11 wherein said first and second switching means comprise transistor pairs operated in a push-pull relationship by said first and second comparator means in response to said first and second reference waveforms.
Claim 14
Dependent Claim
54 words
A variable voltage power supply according to claim 1 wherein said output means comprises a center-tapped transformer winding, said first comparator compares said first reference waveform with the voltage at one end of said winding, and said second comparator compares said second reference waveform with the voltage at an opposite end of said winding.
Claim 15
Dependent Claim
78 words
A variable voltage power supply according to claim 13 wherein said electrical energy storage means comprises first and second storage means; said first switching means comprises first electronic switch means that during on periods is driven to saturation and said first storage means limits change in said output voltage; and said second switching means comprises second electronic switch means that during on periods is driven to saturation and said second storage means limits change in said output voltage.
Claim 16
Dependent Claim
35 words
A variable voltage power supply according to claim 14 wherein said power source comprises an AC supply, and including battery means connected to alternatively receive or supply energy to said first and second storage means.
Claim 17
Dependent Claim
32 words
A variable voltage power supply according to claim 15 wherein said AC source comprises a sine wave generator, and said means for producing said first and second waveforms comprises a split rectifier.
Claim 18
Dependent Claim
34 words
A variable voltage power supply according to claim 16 wherein said reference source means further comprises phase lock means for locking the phase of said sine wave generator to that of said AC supply.
Claim 19
Dependent Claim
31 words
A variable voltage power supply according to claim 17 wherein said power source means comprises voltage regulator means coupled between said AC supply and said first and second energy storage means.
Claim 20
Dependent Claim
37 words
A variable voltage power supply according to claim 14 wherein said first energy storage means comprises first inductance means and first capacitance means, and said second energy storage means comprises second inductance means and second capacitance means.
Claim 21
Dependent Claim
64 words
A variable voltage power supply according to claim 19 including first and second transfer means, said first transfer means transferring energy stored by said first inductance means to said source means during off periods of said first switching means, and said second transfer means transferring energy stored by said second inductance means to said source means during off periods of said second switching means.
Claim 22
Dependent Claim
108 words
A variable voltage power supply according to claim 20 wherein said first transfer means comprises a first unidirectional conduction means connected between said first inductance means and said source means and adapted to conduct current only in response to a threshold voltage provided by a collapsing magnetic field in said first inductance means caused by opening of said first switching means, and a second unidirectional conduction means connected between said second inductance means and said source means and adapted to conduct current only in response to a threshold voltage provided by a collapsing magnetic field in said second inductance means caused by opening of said second switching means.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-11-11 | 1989-05-13 | 1989-11-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-11-11 | 1993-05-13 | 1993-11-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-11-11 | 1997-05-13 | 1997-11-12 | $7700.00 | Window Closed / Lapsed |